A predictive model for polyethylene cable insulation degradation in combined thermal and radiation environments

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F46356088%3A_____%2F18%3AN0000004" target="_blank" >RIV/46356088:_____/18:N0000004 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.polymdegradstab.2018.11.002" target="_blank" >http://dx.doi.org/10.1016/j.polymdegradstab.2018.11.002</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.polymdegradstab.2018.11.002" target="_blank" >10.1016/j.polymdegradstab.2018.11.002</a>

Jazyk výsledku

angličtina

Název v původním jazyce

A predictive model for polyethylene cable insulation degradation in combined thermal and radiation environments

Popis výsledku v původním jazyce

Reliable prediction of material service lifetime is important for ensuring safe operation in safety-critical systems such as nuclear facilities. Materials in these environments degrade due to several simultaneous effects, most important stressors are heat and radiation. In this work, samples of medium density polyethylene cable insulation were subjected to thermal (110 degrees C) and gamma-radiation stress (500 Gy h(-1)); a combined thermal and radiation test (85 degrees C and 4.5 Gy h(-1)) was also performed. Stability of cable insulation was studied by differential scanning calorimetry and isoconversional kinetic analysis employing a non-Arrhenian temperature function was carried out. From the dependence of residual stability on the degradation dose a predictive model for the cable service life was developed based on the thermal and radiation stress tests; the model validity was verified using the combined stress test results. The model assumes a first-order exponential decay of the residual stability with degradation dose. It allows to predict the degree of insulation damage in wide range of environmental conditions as both temperature and radiation dose effects are considered and radiation dose rate effect is also taken into account.

Název v anglickém jazyce

A predictive model for polyethylene cable insulation degradation in combined thermal and radiation environments

Popis výsledku anglicky

Reliable prediction of material service lifetime is important for ensuring safe operation in safety-critical systems such as nuclear facilities. Materials in these environments degrade due to several simultaneous effects, most important stressors are heat and radiation. In this work, samples of medium density polyethylene cable insulation were subjected to thermal (110 degrees C) and gamma-radiation stress (500 Gy h(-1)); a combined thermal and radiation test (85 degrees C and 4.5 Gy h(-1)) was also performed. Stability of cable insulation was studied by differential scanning calorimetry and isoconversional kinetic analysis employing a non-Arrhenian temperature function was carried out. From the dependence of residual stability on the degradation dose a predictive model for the cable service life was developed based on the thermal and radiation stress tests; the model validity was verified using the combined stress test results. The model assumes a first-order exponential decay of the residual stability with degradation dose. It allows to predict the degree of insulation damage in wide range of environmental conditions as both temperature and radiation dose effects are considered and radiation dose rate effect is also taken into account.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20505 - Composites (including laminates, reinforced plastics, cermets, combined natural and synthetic fibre fabrics; filled composites)

Projekt

—

Návaznosti

N - Vyzkumna aktivita podporovana z neverejnych zdroju

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Polymer Degradation and Stability

ISSN

0141-3910

e-ISSN

1873-2321

Svazek periodika

158

Číslo periodika v rámci svazku

December

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

5

Strana od-do

119-123

Kód UT WoS článku

000452930600013

EID výsledku v databázi Scopus

2-s2.0-85056209101